forked from OSchip/llvm-project
147 lines
4.6 KiB
C++
147 lines
4.6 KiB
C++
//=====-- PPCSubtarget.h - Define Subtarget for the PPC -------*- C++ -*--====//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Nate Begeman and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the PowerPC specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#ifndef POWERPCSUBTARGET_H
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#define POWERPCSUBTARGET_H
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#include "llvm/Target/TargetInstrItineraries.h"
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#include "llvm/Target/TargetSubtarget.h"
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#include <string>
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// GCC #defines PPC on Linux but we use it as our namespace name
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#undef PPC
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namespace llvm {
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namespace PPC {
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// -m directive values.
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enum {
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DIR_32,
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DIR_601,
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DIR_602,
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DIR_603,
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DIR_7400,
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DIR_750,
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DIR_970,
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DIR_64
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};
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}
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class Module;
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class GlobalValue;
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class TargetMachine;
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class PPCSubtarget : public TargetSubtarget {
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public:
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enum AsmWriterFlavorTy {
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OldMnemonic, NewMnemonic, Unset
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};
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protected:
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const TargetMachine &TM;
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/// stackAlignment - The minimum alignment known to hold of the stack frame on
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/// entry to the function and which must be maintained by every function.
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unsigned StackAlignment;
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/// Selected instruction itineraries (one entry per itinerary class.)
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InstrItineraryData InstrItins;
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/// Which cpu directive was used.
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unsigned DarwinDirective;
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/// AsmFlavor - Which PPC asm dialect to use.
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AsmWriterFlavorTy AsmFlavor;
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/// Used by the ISel to turn in optimizations for POWER4-derived architectures
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bool IsGigaProcessor;
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bool Has64BitSupport;
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bool Use64BitRegs;
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bool IsPPC64;
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bool HasAltivec;
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bool HasFSQRT;
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bool HasSTFIWX;
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bool IsDarwin;
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bool HasLazyResolverStubs;
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public:
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/// This constructor initializes the data members to match that
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/// of the specified module.
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///
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PPCSubtarget(const TargetMachine &TM, const Module &M,
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const std::string &FS, bool is64Bit);
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/// ParseSubtargetFeatures - Parses features string setting specified
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/// subtarget options. Definition of function is auto generated by tblgen.
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void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
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/// SetJITMode - This is called to inform the subtarget info that we are
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/// producing code for the JIT.
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void SetJITMode();
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/// getStackAlignment - Returns the minimum alignment known to hold of the
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/// stack frame on entry to the function and which must be maintained by every
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/// function for this subtarget.
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unsigned getStackAlignment() const { return StackAlignment; }
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/// getDarwinDirective - Returns the -m directive specified for the cpu.
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///
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unsigned getDarwinDirective() const { return DarwinDirective; }
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/// getInstrItins - Return the instruction itineraies based on subtarget
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/// selection.
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const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
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/// getTargetDataString - Return the pointer size and type alignment
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/// properties of this subtarget.
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const char *getTargetDataString() const {
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return isPPC64() ? "E-p:64:64-f64:32:64-i64:32:64-f128:64:128"
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: "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
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}
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/// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
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///
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bool isPPC64() const { return IsPPC64; }
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/// has64BitSupport - Return true if the selected CPU supports 64-bit
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/// instructions, regardless of whether we are in 32-bit or 64-bit mode.
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bool has64BitSupport() const { return Has64BitSupport; }
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/// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
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/// registers in 32-bit mode when possible. This can only true if
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/// has64BitSupport() returns true.
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bool use64BitRegs() const { return Use64BitRegs; }
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/// hasLazyResolverStub - Return true if accesses to the specified global have
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/// to go through a dyld lazy resolution stub. This means that an extra load
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/// is required to get the address of the global.
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bool hasLazyResolverStub(const GlobalValue *GV) const;
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// Specific obvious features.
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bool hasFSQRT() const { return HasFSQRT; }
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bool hasSTFIWX() const { return HasSTFIWX; }
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bool hasAltivec() const { return HasAltivec; }
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bool isGigaProcessor() const { return IsGigaProcessor; }
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bool isDarwin() const { return IsDarwin; }
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bool isMachoABI() const { return IsDarwin || IsPPC64; }
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bool isELF32_ABI() const { return !IsDarwin && !IsPPC64; }
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unsigned getAsmFlavor() const {
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return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
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}
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};
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} // End llvm namespace
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#endif
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